There were many problems that I had with the game I had last night. 2 of them deal with managing units in the field.
The first problem is selecting units in a group in the field or orbiting starbases. I had a bunch of small ships orbiting starbase and I was sending them out in fleets. A way to do that is select them and order them to leave. Of course, I was dealing with logistics of 40, so I was selecting them in groups of 13. Later, I would upgrade them in the field, which removes all ships from fleets, so then I would have to select them all again so that I could order them to become fleets. Again, I had to select them in groups of 13. This problem would have been much simpler if I had the option of being able to use ctrl + A (to select all), or be able to shift + click to select all ships from ship 1 to ship 13.
I suppose that is another reason to go with larger hulls, fewer ships to deal with.
The other problem was decommissioning a whole bunch of ships in one go. When I had enough large hulled ships running around, I started to decommision my old small ships. Well, guess what? You have to do that 1 ship at a time. To decommission a ship, it takes several mouse clicks. I wasn't happy about that. Back in GalCiv 2, I could delete a fleet by clicking delete (or was it backspace?), and the game would ask if I was sure. It was something that could be quickly done.
I know that there are many UI problems that need fixing or a complete overhaul, but these were things that really annoyed me yesterday.